California Code, Streets and Highways Code - SHC § 856

Within sixty days after the completion of posting, any person may make and file at the place specified in said resolution his written objection to such proposed change in grade, setting forth the amount in which he claims that his interest in any real property will be damaged if such change be completed.  Such objections may be filed by mailing them by registered mail, return receipt requested, or by personal delivery to the address specified in the notice as the place for presenting objections.

Any person failing to file such written objection within such sixty day period waives his right to compensation for any damage to his property by such change of grade.